Sorry, it actually is going to be for an SBR, I didn't realize I had a midlength rail selected when I threw the link up there.
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Doesn't midwest industries make one too
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Midwest Industries does make a free float with the front post cut out. It's the Gen2 "extended carbine" 2 piece free float.
Fortis makes a fsp cutout rail as well. I have a DD 9.5 fsp lite rail on my colt 6920. I really like it a lot but if I were starting a new project, I'd get something easier like a centurion (if you can find one) or fortis.